ClC1C=CC=C(C(OO)=[O:9])C=1.[NH2:12][C:13]1[S:14][CH:15]=[C:16]([CH2:18][S:19][C:20]2[CH:25]=[CH:24][C:23]([NH2:26])=[CH:22][CH:21]=2)[N:17]=1>ClCCl.CN(C)C=O>[NH2:12][C:13]1[S:14][CH:15]=[C:16]([CH2:18][S:19]([C:20]2[CH:25]=[CH:24][C:23]([NH2:26])=[CH:22][CH:21]=2)=[O:9])[N:17]=1A solution of 3-chloroperbenzoic acid (4.9 g) in dichloromethane (100 ml) was dropwise added to a solution of 2-amino-4-(4-aminophenylthiomethyl)thiazole (5.1 g) in a mixture of dichloromethane (200 ml) and N,N-dimethylformamide (10 ml) at 5° C. with stirring. The mixture was stirred at 5° C. for 1.5 hours with stirring. The precipitates were collected by filtration, washed with ethyl acetate and dried in vacuo to give solid. The solid was recrystallized from ethanol to give 2-amino-4- (4-aminophenylsulfinylmethyl)thiazole (4.70 g, yield: 86.3%).
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